<!DOCTYPE html>
<html lang="en-US">
    <head>
        <title>IO::Tee - Multiplex output to multiple output handles - metacpan.org</title>
        <link rel="preload" as="fetch" href="https://metacpan.org/account/login_status" crossorigin="anonymous" />
        <link href="https://metacpan.org/_assets/b8ccceeed47a0652049703d99326a9cea4933443.css" rel="stylesheet" type="text/css">
        <script src="https://metacpan.org/_assets/6bfedafe2d7caa915b7d84f61b45936818e3242e.js" type="text/javascript" defer></script>
        <link rel="alternate" type="application/rss+xml" title="Recent CPAN Uploads of IO-Tee - MetaCPAN" href="https://metacpan.org/dist/IO-Tee/releases.rss" />
        <link rel="canonical" href="./IO::Tee.html" />
        <meta name="description" content="Multiplex output to multiple output handles" />
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5">
        <link rel="shortcut icon" href="https://metacpan.org/static/icons/favicon.ico">
        <link rel="apple-touch-icon" sizes="152x152" href="https://metacpan.org/static/icons/apple-touch-icon.png">
        <link rel="search" href="https://metacpan.org/static/opensearch.xml" type="application/opensearchdescription+xml" title="MetaCPAN">
        <script>
          (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
          (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
          m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
          })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

          (function(skey, ga_id){
            ga('create', ga_id, {
              siteSpeedSampleRate : 100,
              storage             : 'none',
              clientId            : localStorage.getItem(skey)
            });
            ga(function(tracker) {
              localStorage.setItem(skey, tracker.get('clientId'));
            });
            ga('send', 'pageview');
          })('ga:clientId', 'UA-27829474-1');
        </script>
<meta name="twitter:card"        content="summary" />
<meta name="twitter:url"         content="https://metacpan.org/pod/IO::Tee" />
<meta name="twitter:title"       content="IO::Tee" />
<meta name="twitter:description" content="Multiplex output to multiple output handles" />
<meta name="twitter:site"        content="metacpan" />
    </head>
    <body>
        <nav class="navbar navbar-default" role="navigation">
            <div class="header-logo-large hidden-xs">
              <a href="https://metacpan.org/" tabindex="0">
                <svg class="logo" aria-label="MetaCPAN">
                  <use class="logo" href="/static/images/metacpan-logo.svg#logo" />
                </svg>
              </a>
            </div>
            <div class="header-logo-icon visible-xs">
              <a href="https://metacpan.org/">
                <svg class="logo" aria-label="MetaCPAN">
                  <use class="logo" href="/static/images/metacpan-logo.svg#dots" />
                </svg>
              </a>
            </div>
            <ul class="nav navbar-nav menu-items hidden-xs hidden-sm">
              <li><a href="https://metacpan.org/about">About</a></li>
              <li><a href="https://metacpan.org/about/sponsors">Sponsor</a></li>
              <li><a href="https://grep.metacpan.org/">grep::cpan</a></li>
              <li><a href="https://metacpan.org/recent">Recent</a></li>
              <li><a href="https://metacpan.org/about/faq">FAQ</a></li>
              <li><a href="https://metacpan.org/tools">Tools</a></li>
              <li><a href="https://fastapi.metacpan.org/">API</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <button type="button" class="searchbar-btn visible-xs visible-sm">
                    <i class="fa fa-search button-fa-icon"></i>
                </button>
                <form action="https://metacpan.org/search" class="searchbar-form visible-md visible-lg search-form form-horizontal">
                   <input type="hidden" name="size" id="metacpan_search-size" value="20">
                  <div class="form-group">
                      <div class="search-group">
                        <i class="fa fa-search"></i>
                        <input type="text" name="q" placeholder="Search the CPAN" size="41" autocorrect="off" autocapitalize="off" spellcheck="false" id="metacpan_search-input" class="form-control" value="">
                      </div>
                  </div>
                </form>
                    <li class="icon-slidepanel visible-xs visible-sm">
                      <button data-toggle="slidepanel" data-target=".slidepanel">
                        <span class="button-fa-icon">
                          <i class="fa fa-bars slidepanel-open"></i>
                          <i class="fa fa-times slidepanel-close"></i>
                        </span>
                      </button>
                    </li>
                <form action="https://metacpan.org/account/logout" method="POST" id="metacpan-logout"></form>
                <li class="dropdown logged_in" style="display: none;">
                    <button type="button" class="dropdown-toggle" data-toggle="dropdown">
                      <i class="fa fa-user button-fa-icon logged-in-icon" aria-hidden="true"></i>
                      <i class="fas fa-chevron-down"></i>
                    </button>
                    <ul class="dropdown-menu">
                        <li><a href="https://metacpan.org/account/identities">Identities</a></li>
                        <li><a href="https://metacpan.org/account/profile">Profile</a></li>
                        <li><a href="https://metacpan.org/account/favorite/list">Favorites</a></li>
                        <li>
                            <a href="./IO::Tee.html#" type="button" onclick="$('#metacpan-logout').submit(); return false">
                              Logout
                            </a>
                        </li>
                    </ul>
                </li>
                <li class="dropdown logged_out" style="display: none;">
                    <button type="button" class="dropdown-toggle" data-toggle="dropdown">
                      <i class="fa fa-user button-fa-icon" aria-hidden="true"></i>
                      <i class="fas fa-chevron-down"></i>
                    </button>
                    <ul class="dropdown-menu">
                        <li>
                            <a href="https://metacpan.org/login/github">
                                <i class="fab fa-github fa-fw"></i>
                                GitHub
                            </a>
                        </li>
                        <li>
                            <a href="https://metacpan.org/login/twitter">
                                <i class="fab fa-twitter fa-fw"></i>
                                Twitter
                            </a>
                        </li>
                        <li>
                            <a href="https://metacpan.org/login/google">
                                <i class="fab fa-google fa-fw"></i>
                                Google
                            </a>
                        </li>
                    </ul>
                </li>
                <li class="dropdown logged_placeholder">
                    <button>
                      <i class="fa fa-user button-fa-icon" aria-hidden="true"></i>
                    </button>
                </li>
            </ul>
        </nav>
        <div class="page-content ">
          <!--
          <div class="top-notify-banner">
            <i class="fas fa-info-circle"></i>
          </div>
          -->
          <nav class="sidebar">
            <div class="slidepanel">
              <ul class="nav-list ">
    <li class="nav-header no-margin-top">
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The date that this version of IO-Tee was released.">
      <span class="relatize">19 Aug 2020 20:02:59 UTC</span>
    </li>
  <li>
    Distribution: <a href="https://metacpan.org/dist/IO-Tee">IO-Tee</a>
  </li>
  <li>
    Module version: 0.65
  </li>
  <li>
    <a data-keyboard-shortcut="g s" href="https://metacpan.org/dist/IO-Tee/source/lib/IO/Tee.pm">Source</a>
    (<a href="https://metacpan.org/dist/IO-Tee/source/lib/IO/Tee.pm?raw=1">raw</a>)
  </li>
  <li>
    <a data-keyboard-shortcut="g b" href="https://metacpan.org/dist/IO-Tee/source/lib/IO">Browse</a>
    (<a href="https://metacpan.org/dist/IO-Tee/source/lib/IO?raw=1">raw</a>)
  </li>
    <li>
      <a data-keyboard-shortcut="g c" href="https://metacpan.org/dist/IO-Tee/changes">Changes</a>
    </li>
    <li>
      <a rel="noopener nofollow" class="nopopup" href="https://github.com/neilb/IO-Tee">Homepage</a>
    </li>
    <li>
      <a class="nopopup" href="https://metacpan.org/dist/IO-Tee/contribute">How to Contribute</a>
    </li>
    <li>
        <a rel="noopener nofollow" data-keyboard-shortcut="g r" href="https://github.com/neilb/IO-Tee">Repository</a>
    </li>
    <li>
      <a rel="noopener nofollow" data-keyboard-shortcut="g i" href="https://rt.cpan.org/Public/Dist/Display.html?Name=IO-Tee">Issues</a>
      (5)
    </li>
    <li>
      <a rel="noopener nofollow" href="http://matrix.cpantesters.org/?dist=IO-Tee+0.66" title="Matrix">Testers</a>
        <span title="(pass / fail / na)">(<a rel="noopener nofollow" href="https://www.cpantesters.org/distro/I/IO-Tee.html?oncpan=1&amp;distmat=1&amp;version=0.66&amp;grade=2" style="color: #090">1849</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/I/IO-Tee.html?oncpan=1&amp;distmat=1&amp;version=0.66&amp;grade=3" style="color: #900">0</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/I/IO-Tee.html?oncpan=1&amp;distmat=1&amp;version=0.66&amp;grade=4">0</a>)</span>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpants.cpanauthors.org/release/NEILB/IO-Tee-0.66">Kwalitee</a>
    </li>
    <li>
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The # people with an indexing permission on IO-Tee who have released something to CPAN in the last 2 years (i.e. the # people likely able to release critical fixes in a timely manner)">
      Bus factor: 1
      </div>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpancover.com/latest/IO-Tee-0.66/index.html">55.74% Coverage </a>
    </li>
    <li>
      License: perl_5
    </li>
    <li>
      Perl: v5.6.0
    </li>
    <li class="nav-header">Activity</li>
    <li>
<div class="activity-graph">
    <img src="https://metacpan.org/dist/IO-Tee/activity.svg?res=month" />
    <div class="comment">24 month</div>
</div>
    </li>
    <li class="nav-header">Tools</li>
    <li>
      <a itemprop="downloadUrl" href="https://cpan.metacpan.org/authors/id/N/NE/NEILB/IO-Tee-0.66.tar.gz">
      Download (<span itemprop="fileSize">12.58KB</span>)</a>
    </li>
    <li>
      <a href="https://explorer.metacpan.org/?url=%2Fmodule%2FNEILB%2FIO-Tee-0.66%2Flib%2FIO%2FTee.pm">
        MetaCPAN Explorer
      </a>
    </li>
    <li>
      <a href="https://metacpan.org/dist/IO-Tee/permissions">
        Permissions
      </a>
    </li>
    <li>
      <a href="https://metacpan.org/dist/IO-Tee/releases.rss">
        Subscribe to distribution
      </a>
    </li>
    <li>
      <button class="btn btn-link" data-toggle="modal" data-target="#metacpan_install-instructions-dialog">
        Install Instructions
      </button>
    </li>
    <li>
      <form action="https://metacpan.org/search">
        <input type="hidden" name="q" value="dist:IO-Tee">
        <input type="search" name="q" placeholder="Search distribution" class="form-control tool-bar-form">
        <input type="submit" style="display: none">
      </form>
    </li>
    <li>
      <form action="https://grep.metacpan.org/search">
        <input type="hidden" name="qd" value="IO-Tee">
        <input type="hidden" name="source" value="metacpan">
        <input type="search" name="q" placeholder="grep distribution" class="form-control tool-bar-form">
        <input type="submit" style="display: none">
     </form>
    </li>
    <li class="version-jump">
<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/IO/Tee.pm&#39;" class="form-control tool-bar-form">
  <option disabled selected>Jump to version</option>
<option
  disabled
  value="NEILB/IO-Tee-0.66"
>0.66
  (NEILB on 2020-08-19)</option>
<option
  
  value="KENSHAN/IO-Tee-0.64"
>0.64
  (KENSHAN on 2001-03-10)</option>
<optgroup label="BackPAN">'
<option
  
  value="NEILB/IO-Tee-0.65_01"
>0.65_01 DEV
  (NEILB on 2020-08-14)</option>
<option
  
  value="NEILB/IO-Tee-0.65"
>0.65
  (NEILB on 2017-08-16)</option>
<option
  
  value="KENSHAN/IO-Tee-0.63"
>0.63
  (KENSHAN on 1998-11-07)</option>
<option
  
  value="KENSHAN/IO-Tee-0.62"
>0.62
  (KENSHAN on 1998-04-20)</option>
<option
  
  value="KENSHAN/IO-Tee-0.61"
>0.61
  (KENSHAN on 1998-04-17)</option>
<option
  
  value="KENSHAN/IO-Tee-0.60"
>0.60
  (KENSHAN on 1998-03-04)</option>
<option
  
  value="JWIED/IO-Tee-0.01"
>0.01
  (JWIED on 1998-03-01)</option>
</optgroup>
</select>
    </li>
    <li class="version-diff">
<select onchange="document.location.href='/release/NEILB/IO-Tee-0.66/diff/' + encodeURIComponent(this.value) + '/lib/IO/Tee.pm'
" class="form-control tool-bar-form">
  <option disabled selected>Diff with version</option>
<option
  disabled
  value="NEILB/IO-Tee-0.66"
>0.66
  (NEILB on 2020-08-19)</option>
<option
  
  value="KENSHAN/IO-Tee-0.64"
>0.64
  (KENSHAN on 2001-03-10)</option>
<optgroup label="BackPAN">'
<option
  
  value="NEILB/IO-Tee-0.65_01"
>0.65_01 DEV
  (NEILB on 2020-08-14)</option>
<option
  
  value="NEILB/IO-Tee-0.65"
>0.65
  (NEILB on 2017-08-16)</option>
<option
  
  value="KENSHAN/IO-Tee-0.63"
>0.63
  (KENSHAN on 1998-11-07)</option>
<option
  
  value="KENSHAN/IO-Tee-0.62"
>0.62
  (KENSHAN on 1998-04-20)</option>
<option
  
  value="KENSHAN/IO-Tee-0.61"
>0.61
  (KENSHAN on 1998-04-17)</option>
<option
  
  value="KENSHAN/IO-Tee-0.60"
>0.60
  (KENSHAN on 1998-03-04)</option>
<option
  
  value="JWIED/IO-Tee-0.01"
>0.01
  (JWIED on 1998-03-01)</option>
</optgroup>
</select>
    </li>

    <li>
<ul class="dependencies">
  <li class="nav-header">Dependencies</li>
  <li><a href="https://metacpan.org/pod/Carp" title="Carp" class="ellipsis">Carp</a></li>
  <li><a href="https://metacpan.org/pod/IO::File" title="IO::File" class="ellipsis">IO::File</a></li>
  <li><a href="https://metacpan.org/pod/IO::Handle" title="IO::Handle" class="ellipsis">IO::Handle</a></li>
  <li><a href="https://metacpan.org/pod/Symbol" title="Symbol" class="ellipsis">Symbol</a></li>
  <li><a href="https://metacpan.org/pod/parent" title="parent" class="ellipsis">parent</a></li>
  <li><a href="https://metacpan.org/pod/strict" title="strict" class="ellipsis">strict</a></li>
  <li><a href="https://metacpan.org/pod/warnings" title="warnings" class="ellipsis">warnings</a></li>
  <li>
    <hr>
  </li>
  <li>
    <a href="https://metacpan.org/module/IO::Tee/requires">Reverse dependencies</a>
  </li>
  <li>
    <a href="http://deps.cpantesters.org/?module=IO%3A%3ATee">CPAN Testers List</a>
  </li>
  <li>
    <a href="https://cpandeps.grinnz.com/?dist=IO-Tee">Dependency graph</a>
  </li>
</ul>
    </li>
    <li class="nav-header">Permalinks</li>
    <li>
      <a href="https://metacpan.org/release/NEILB/IO-Tee-0.66/view/lib/IO/Tee.pm">This version</a>
    </li>
    <li>
      <a href="./IO::Tee.html">Latest version</a>
    </li>
    <li>
<div class="plussers">
<div class="nav-header">++ed by:</div>
<div>
<a class="display-all" href="https://metacpan.org/author/RWP"><img src="https://www.gravatar.com/avatar/7110eb2389e69a066d9d7cad7a1cc2bf?d=identicon&amp;s=20" title="RWP" alt="RWP"></a>
</div>
<!-- Display counts of plussers-->
<div>
    <a href="https://metacpan.org/dist/IO-Tee/plussers">1 PAUSE user</a>
</div>
<div>
    1 non-PAUSE user
</div>
</div>
    </li>
    <li>
<div id="metacpan_contributors">
  <div>
    <button class="btn-link"
      onclick="$(this).hide(); $('#metacpan_contributors ul').slideDown(); return false;"
    >and 1 contributors</button>
  </div>
  <ul style="display: none">
    <li class="contributor"
      data-contrib-email="ken@digitas.harvard.edu"
    >
      <img class="gravatar" width="20" height="20" src="https://www.gravatar.com/avatar/d41d8cd98f00b204e9800998ecf8427e?d=identicon&amp;s=20" />
      Chung-chieh Shan
    </li>
  </ul>
</div>
    </li>
              </ul>
            </div>
          </nav>
          <div class="content-navigation">
<div class="breadcrumbs">
  <span>
    <a data-keyboard-shortcut="g a" rel="author" href="https://metacpan.org/author/NEILB" class="author-name">Neil Bowers</a>
  </span>
  <span>&nbsp;/&nbsp;</span>
  <div class="release dist-release status-latest maturity-released">
    <span class="dropdown"><b class="caret"></b></span>
<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/IO/Tee.pm&#39;" class="">
<option
  selected
  value="NEILB/IO-Tee-0.66"
>0.66
  (NEILB on 2020-08-19)</option>
<option
  
  value="KENSHAN/IO-Tee-0.64"
>0.64
  (KENSHAN on 2001-03-10)</option>
<optgroup label="BackPAN">'
<option
  
  value="NEILB/IO-Tee-0.65_01"
>0.65_01 DEV
  (NEILB on 2020-08-14)</option>
<option
  
  value="NEILB/IO-Tee-0.65"
>0.65
  (NEILB on 2017-08-16)</option>
<option
  
  value="KENSHAN/IO-Tee-0.63"
>0.63
  (KENSHAN on 1998-11-07)</option>
<option
  
  value="KENSHAN/IO-Tee-0.62"
>0.62
  (KENSHAN on 1998-04-20)</option>
<option
  
  value="KENSHAN/IO-Tee-0.61"
>0.61
  (KENSHAN on 1998-04-17)</option>
<option
  
  value="KENSHAN/IO-Tee-0.60"
>0.60
  (KENSHAN on 1998-03-04)</option>
<option
  
  value="JWIED/IO-Tee-0.01"
>0.01
  (JWIED on 1998-03-01)</option>
</optgroup>
</select>
    <a data-keyboard-shortcut="g d" class="release-name" href="https://metacpan.org/dist/IO-Tee">IO-Tee-0.66</a>
  </div>
<span class="river-gauge-gauge">
  <svg width="24px"
       height="15px"
       version="1.1"
       xmlns="http://www.w3.org/2000/svg"
       xmlns:xlink="http://www.w3.org/1999/xlink">

    <g>
      <title>        River stage one &#10;
          • 6 direct dependents &#10;          • 7 total dependents
      </title>

      <rect x="0"  y="0" width="4" height="15" fill="#7ea3f2" />
      <rect x="5"  y="0" width="4" height="15" fill="#e4e2e2" />
      <rect x="10"  y="0" width="4" height="15" fill="#e4e2e2" />
      <rect x="15"  y="0" width="4" height="15" fill="#e4e2e2" />
      <rect x="20"  y="0" width="4" height="15" fill="#e4e2e2" />
    </g>
  </svg>

</span>
<div id="IO-Tee-fav" class="logged_in">
<form action="https://metacpan.org/account/favorite/add" style="display: inline" onsubmit="return favDistribution(this)">
    <input type="hidden" name="remove" value="0">
    <input type="hidden" name="release" value="IO-Tee-0.66">
    <input type="hidden" name="author" value="NEILB">
    <input type="hidden" name="distribution" value="IO-Tee">
    <button type="submit" class="favorite highlight"><span>2</span> ++</button>
</form>
</div>
<div class="logged_out">
<a href="./IO::Tee.html" onclick="alert('Please sign in to add favorites'); return false" class="favorite highlight">
<span>2</span> ++</a>
</div>
   / <span>IO::Tee</span>
</div>
          </div>
          <main class="content">


<nav class="toc">
  <div class="toc-header"><strong>Contents</strong></div>
<ul>
  <li><a href="./IO::Tee.html#NAME">NAME</a></li>
  <li><a href="./IO::Tee.html#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="./IO::Tee.html#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="./IO::Tee.html#EXAMPLE">EXAMPLE</a></li>
  <li><a href="./IO::Tee.html#REPOSITORY">REPOSITORY</a></li>
  <li><a href="./IO::Tee.html#AUTHOR">AUTHOR</a></li>
  <li><a href="./IO::Tee.html#COPYRIGHT">COPYRIGHT</a></li>
  <li><a href="./IO::Tee.html#SEE-ALSO">SEE ALSO</a></li>
</ul></nav>
<div class="pod anchors">
<h1 id="NAME">NAME</h1>

<p>IO::Tee - Multiplex output to multiple output handles</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>    use IO::Tee;

    $tee = IO::Tee-&gt;new($handle1, $handle2);
    print $tee &quot;foo&quot;, &quot;bar&quot;;
    my $input = &lt;$tee&gt;;</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p><code>IO::Tee</code> objects can be used to multiplex input and output in two different ways. The first way is to multiplex output to zero or more output handles. The <code>IO::Tee</code> constructor, given a list of output handles, returns a tied handle that can be written to. When written to (using print or printf), the <code>IO::Tee</code> object multiplexes the output to the list of handles originally passed to the constructor. As a shortcut, you can also directly pass a string or an array reference to the constructor, in which case <code>IO::File::new</code> is called for you with the specified argument or arguments.</p>

<p>The second way is to multiplex input from one input handle to zero or more output handles as it is being read. The <code>IO::Tee</code> constructor, given an input handle followed by a list of output handles, returns a tied handle that can be read from as well as written to. When written to, the <code>IO::Tee</code> object multiplexes the output to all handles passed to the constructor, as described in the previous paragraph. When read from, the <code>IO::Tee</code> object reads from the input handle given as the first argument to the <code>IO::Tee</code> constructor, then writes any data read to the output handles given as the remaining arguments to the constructor.</p>

<p>The <code>IO::Tee</code> class supports certain <code>IO::Handle</code> and <code>IO::File</code> methods related to input and output. In particular, the following methods will iterate themselves over all handles associated with the <code>IO::Tee</code> object, and return TRUE indicating success if and only if all associated handles returned TRUE indicating success:</p>

<dl>

<dt id="close">close</dt>
<dd>

</dd>
<dt id="truncate">truncate</dt>
<dd>

</dd>
<dt id="write">write</dt>
<dd>

</dd>
<dt id="syswrite">syswrite</dt>
<dd>

</dd>
<dt id="format_write">format_write</dt>
<dd>

</dd>
<dt id="formline">formline</dt>
<dd>

</dd>
<dt id="fcntl">fcntl</dt>
<dd>

</dd>
<dt id="ioctl">ioctl</dt>
<dd>

</dd>
<dt id="flush">flush</dt>
<dd>

</dd>
<dt id="clearerr">clearerr</dt>
<dd>

</dd>
<dt id="seek">seek</dt>
<dd>

</dd>
</dl>

<p>The following methods perform input multiplexing as described above:</p>

<dl>

<dt id="read">read</dt>
<dd>

</dd>
<dt id="sysread">sysread</dt>
<dd>

</dd>
<dt id="readline">readline</dt>
<dd>

</dd>
<dt id="getc">getc</dt>
<dd>

</dd>
<dt id="gets">gets</dt>
<dd>

</dd>
<dt id="eof">eof</dt>
<dd>

</dd>
<dt id="getline">getline</dt>
<dd>

</dd>
<dt id="getlines">getlines</dt>
<dd>

</dd>
</dl>

<p>The following methods can be used to set (but not retrieve) the current values of output-related state variables on all associated handles:</p>

<dl>

<dt id="autoflush">autoflush</dt>
<dd>

</dd>
<dt id="output_field_separator">output_field_separator</dt>
<dd>

</dd>
<dt id="output_record_separator">output_record_separator</dt>
<dd>

</dd>
<dt id="format_page_number">format_page_number</dt>
<dd>

</dd>
<dt id="format_lines_per_page">format_lines_per_page</dt>
<dd>

</dd>
<dt id="format_lines_left">format_lines_left</dt>
<dd>

</dd>
<dt id="format_name">format_name</dt>
<dd>

</dd>
<dt id="format_top_name">format_top_name</dt>
<dd>

</dd>
<dt id="format_line_break_characters">format_line_break_characters</dt>
<dd>

</dd>
<dt id="format_formfeed">format_formfeed</dt>
<dd>

</dd>
</dl>

<p>The following methods are directly passed on to the input handle given as the first argument to the <code>IO::Tee</code> constructor:</p>

<dl>

<dt id="input_record_separator">input_record_separator</dt>
<dd>

</dd>
<dt id="input_line_number">input_line_number</dt>
<dd>

</dd>
</dl>

<p>Note that the return value of input multiplexing methods (such as <code>print</code>) is always the return value of the input action, not the return value of subsequent output actions. In particular, no error is indicated by the return value if the input action itself succeeds but subsequent output multiplexing fails.</p>

<h1 id="EXAMPLE">EXAMPLE</h1>

<pre><code>    use IO::Tee;
    use IO::File;

    my $tee = new IO::Tee(\*STDOUT,
        new IO::File(&quot;&gt;tt1.out&quot;), &quot;&gt;tt2.out&quot;);

    print join(&#39; &#39;, $tee-&gt;handles), &quot;\n&quot;;

    for (1..10) { print $tee $_, &quot;\n&quot; }
    for (1..10) { $tee-&gt;print($_, &quot;\n&quot;) }
    $tee-&gt;flush;

    $tee = new IO::Tee(&#39;&lt;/etc/passwd&#39;, \*STDOUT);
    my @lines = &lt;$tee&gt;;
    print scalar(@lines);</code></pre>

<h1 id="REPOSITORY">REPOSITORY</h1>

<p><a href="https://github.com/neilb/IO-Tee">https://github.com/neilb/IO-Tee</a></p>

<h1 id="AUTHOR">AUTHOR</h1>

<p>Chung-chieh Shan, ken@digitas.harvard.edu</p>

<p>As of August 2017, now being maintained by Neil Bowers.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright (c) 1998-2017 Chung-chieh Shan. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.</p>

<h1 id="SEE-ALSO"><a id="SEE"></a>SEE ALSO</h1>

<p><a href="functions/CORE.html">perlfunc</a>, <a href="https://metacpan.org/pod/IO::Handle">IO::Handle</a>, <a href="https://metacpan.org/pod/IO::File">IO::File</a>.</p></div>

<div id="metacpan_install-instructions-dialog" class="modal fade">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title">Module Install Instructions</h4>
      </div>
      <div class="modal-body">
        <p>To install IO::Tee, copy and paste the appropriate command in to your terminal.</p>
        <p><a href="https://metacpan.org/dist/App-cpanminus/view/bin/cpanm">cpanm</a></p>
        <pre><code>cpanm IO::Tee</code></pre>
        <p><a href="https://metacpan.org/pod/CPAN">CPAN shell</a></p>
        <pre><code>perl -MCPAN -e shell
install IO::Tee</code></pre>
        <p>For more information on module installation, please visit <a href="https://www.cpan.org/modules/INSTALL.html">the detailed CPAN module installation guide</a>.</p>
      </div>
      <div class="modal-footer">
        <a href="./IO::Tee.html#" data-dismiss="modal" class="btn">Close</a>
      </div>
    </div>
  </div>
</div>
          </main>
          <div class="content-pagination">
          </div>
        </div>
        <footer class="footer">
          <div class="footer-container">
            <div class="footer-social">
              <div class="footer-link footer-logo">
                <a href="https://metacpan.org/">
                  <img src="https://metacpan.org/static/images/metacpan-logo.svg" alt="MetaCPAN" />
                </a>
              </div>
              <a class="footer-social-link" href="https://github.com/metacpan">
                <i class="fab fa-github-square"></i>
              </a>
              <a class="footer-social-link" href="https://fosstodon.org/@metacpan">
                <i class="fab fa-mastodon"></i>
              </a>
            </div>
            <div class="footer-links">
              <div class="footer-link">
                  <a href="https://metacpan.org/about">About</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/about/sponsors">Sponsor</a>
              </div>
              <div class="footer-link">
                  <a href="https://grep.metacpan.org">grep::cpan</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/recent">Recent</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/about/faq">FAQ</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/tools">Tools</a>
              </div>
              <div class="footer-link">
                  <a href="https://fastapi.metacpan.org/">API</a>
              </div>
              <div class="footer-link">
                  <a href="https://www.perl.org/">Perl.org</a>
              </div>
            </div>
            <div class="footer-sponsors">
              <a class="footer-sponsor-link" target="_blank" href="https://www.bytemark.co.uk/" rel="noopener">
                <img class="footer-sponsor-bytemark" src="https://metacpan.org/static/images/sponsors/bytemark_logo.svg" alt="Bytemark logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://www.liquidweb.com/" rel="noopener">
                <img class="footer-sponsor-liquidweb" src="https://metacpan.org/static/images/sponsors/liquidweb_logo.png" alt="liquidweb logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://deriv.com/careers/" rel="noopener">
                <img class="footer-sponsor-deriv" src="https://metacpan.org/static/images/sponsors/deriv.svg" alt="Deriv logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://geocode.xyz" rel="noopener">
                <img class="footer-sponsor-geocode" src="https://metacpan.org/static/images/sponsors/geocodelogo.svg" alt="Geocode logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://www.fastly.com/" rel="noopener">
                <img class="footer-sponsor-fastly" src="https://metacpan.org/static/images/sponsors/fastly_logo.svg" alt="Fastly logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://opencagedata.com" rel="noopener">
                <img class="footer-sponsor-opencage" src="https://metacpan.org/static/images/sponsors/open-cage.svg" alt="OpenCage logo">
              </a>
            </div>
          </div>
        </footer>
        <div class="modal fade" tabindex="-1" role="dialog" id="metacpan_keyboard-shortcuts">
          <div class="modal-dialog">
            <div class="modal-content">
              <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">&times;</button>
                <h4 class="modal-title">Keyboard Shortcuts</h4>
              </div>
              <div class="modal-body row">
<div class="col-md-6">
  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>Global</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="keys">
          <kbd>s</kbd>
        </td>
        <td>Focus search bar</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>?</kbd>
        </td>
        <td>Bring up this help dialog</td>
      </tr>
    </tbody>
  </table>

  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>GitHub</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>p</kbd>
        </td>
        <td>Go to pull requests</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>i</kbd>
        </td>
        <td>go to github issues (only if github is preferred repository)</td>
      </tr>
    </tbody>
  </table>
</div>

<div class="col-md-6">
  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>POD</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>a</kbd>
        </td>
        <td>Go to author</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>c</kbd>
        </td>
        <td>Go to changes</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>i</kbd>
        </td>
        <td>Go to issues</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>d</kbd>
        </td>
        <td>Go to dist</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>r</kbd>
        </td>
        <td>Go to repository/SCM</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>s</kbd>
        </td>
        <td>Go to source</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>b</kbd>
        </td>
        <td>Go to file browse</td>
      </tr>

    </tbody>
  </table>
</div>

<div class="col-md-12">
  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>Search terms</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td><em>module:</em> (e.g. <a href="https://metacpan.org/search?q=module%3APlugin">module:Plugin</a>)</td>
      </tr>
      <tr>
        <td><em>distribution:</em> (e.g. <a href="https://metacpan.org/search?q=distribution%3ADancer+auth">distribution:Dancer auth</a>)</td>
      </tr>
      <tr>
        <td><em>author:</em> (e.g. <a href="https://metacpan.org/search?q=author%3ASONGMU+Redis">author:SONGMU Redis</a>)</td>
      </tr>
      <tr>
        <td><em>version:</em> (e.g. <a href="https://metacpan.org/search?q=version%3A1.00">version:1.00</a>)</td>
      </tr>
    </tbody>
  </table>
</div>
              </div>
              <div class="modal-footer"></div>
            </div>
          </div>
        </div>
    </body>
</html>
